Thomas Magnete has introduced its second-generation
diaphragm pump for selective catalytic reduction (SCR)
systems. The new P800 is a diaphragm pump in which
a solenoid-operated piston pump generates a hydraulic
pulse that displaces a defined volume of fluid, which
deflects an integral diaphragm and injects a metered
amount of AdBlue into the engine exhaust through an
injector nozzle.
PUMPING UP
SCR MODULES,
FUEL CELLS
New emissions systems present fresh opportunities for Thomas Magnete’s
liquid dosing technologies
While oftentimes technical challenges require all-new, out-of-the-box solutions,
just as often, tweaking an existing
technology can provide just the capability needed for another. When that
occurs, manufacturers can find themselves with entirely new business
opportunities.
Such has been the case for
Thomas, the Herdorf, Germany,
designer and manufacturer of actu-
ators, metering pumps and other
solenoid-driven actuators and valves
for a variety of markets, including the
automotive, off-highway, marine and
construction industries.
Most recently, emissions-related
technologies have provided new
opportunities for the company’s
products. Thomas has begun supplying dosing modules for selective
catalytic reduction (SCR) systems
used in mobile and stationary engine
applications.
One of the keys factors in SCR’s
ability to reduce NOx in diesel engine
exhaust involves the precise metering
of a liquid urea reductant — known as
AdBlue in Europe and diesel exhaust
fluid (DEF) in North America — into
the exhaust stream.
In 2008, the company launched
the P700 diaphragm pump designed
for pumping AdBlue in multitank systems. Now the company has released
its second-generation unit, the P800
diaphragm pump.
The second-generation Thomas
dosing units are based on a hydraulically driven diaphragm pump. In
operation, an electromagnetically
driven piston pump generates a
hydraulic pulse that displaces a
defined volume of fluid. That vol-
